From: Robert Klemme <shortcutter@...>
Date: 2008-11-27T16:35:36+09:00
Subject: Re: unexpected error in time difference

On 27.11.2008 08:29, Heesob Park wrote:
> I found some unexpected errors in time difference test.
> Is this a bug or feature?
> 
> irb(main):001:0> Time.now-1
> => Thu Nov 27 16:19:35 +0900 2008
> irb(main):002:0> Time.now -1
> ArgumentError: wrong number of arguments (1 for 0)
>         from (irb):2:in `initialize'
>         from (irb):2:in `now'
>         from (irb):2
> irb(main):003:0> Time.now - 1
> => Thu Nov 27 16:19:40 +0900 2008
> irb(main):004:0> t = Time.now
> => Thu Nov 27 16:19:48 +0900 2008
> irb(main):005:0> Time.now-t
> => 7.250976
> irb(main):006:0> Time.now -t
> NoMethodError: undefined method `-@' for Thu Nov 27 16:19:48 +0900 2008:Time
>         from (irb):6
>         from :0
> irb(main):007:0> Time.now - t
> => 11.539909

Works as designed.  With Time.now -1 the parser parses this as 
Time.now(-1).  Rule of thumb: use spaces around operators - makes your 
code also more readable.

Kind regards

	robert